WHALEN, B. (1981). Workbook for a primer of oilwell service and workover. Association of oilwell servicing contractors.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWHALEN, Bruce. Workbook for a Primer of Oilwell Service and Workover. Association of oilwell servicing contractors, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWHALEN, Bruce. Workbook for a Primer of Oilwell Service and Workover. Association of oilwell servicing contractors, 1981.
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